Sheibani, ShokoofehCapua, LucaKamaei, SadeghAkbari, Sayedeh Shirin AfyouniZhang, JunruiGuerin, HoelIonescu, Adrian M.2021-03-262021-03-262021-03-262021-01-1910.1038/s43246-020-00114-xhttps://infoscience.epfl.ch/handle/20.500.14299/176445WOS:000612232800001Cortisol is a hormone released in response to stress and is a major glucocorticoid produced by adrenal glands. Here, we report a wearable sensory electronic chip using label-free detection, based on a platinum/graphene aptamer extended gate field effect transistor (EG-FET) for the recognition of cortisol in biological buffers within the Debye screening length. The device shows promising experimental features for real-time monitoring of the circadian rhythm of cortisol in human sweat. We report a hysteresis-free EG-FET with a voltage sensitivity of the order of 14 mV/decade and current sensitivity up to 80% over the four decades of cortisol concentration. The detection limit is 0.2 nM over a wide range, between 1 nM and 10 mu M, of cortisol concentrations in physiological fluid, with negligible drift over time and high selectivity. The dynamic range fully covers those in human sweat. We propose a comprehensive analysis and a unified, predictive analytical mapping of current sensitivity in all regimes of operation.Wearable, real-time devices that can monitor hormones are important for personalized healthcare. Here, a platinum/graphene aptamer extended gate field effect transistor is shown to detect cortisol, the primary stress hormone, in physiological fluid.Materials Science, MultidisciplinaryMaterials Sciencesalivary cortisollabel-freepointassayfilmadaptationdisordersbraintext::journal::journal article::research article